1m5k
Crystal structure of a hairpin ribozyme in the catalytically-active conformationCrystal structure of a hairpin ribozyme in the catalytically-active conformation
Structural highlights
Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe hairpin ribozyme catalyses sequence-specific cleavage of RNA. The active site of this natural RNA results from the docking of two irregular helices: stems A and B. One strand of stem A harbours the scissile bond. The 2.4 A resolution structure of a hairpin ribozyme-inhibitor complex reveals that the ribozyme aligns the 2'-OH nucleophile and the 5'-oxo leaving group by twisting apart the nucleotides that flank the scissile phosphate. The base of the nucleotide preceding the cleavage site is stacked within stem A; the next nucleotide, a conserved guanine, is extruded from stem A and accommodated by a highly complementary pocket in the minor groove of stem B. Metal ions are absent from the active site. The bases of four conserved purines are positioned potentially to serve as acid-base catalysts. This is the first structure determination of a fully assembled ribozyme active site that catalyses a phosphodiester cleavage without recourse to metal ions. Crystal structure of a hairpin ribozyme-inhibitor complex with implications for catalysis.,Rupert PB, Ferre-D'Amare AR Nature. 2001 Apr 12;410(6830):780-6. PMID:11298439[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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